I had, but not to any great depth. I knew they were basically a foreign aid agency, but that's about it.
They were supposed to help what are now called Third World countries develop, but morphed into a political slush fund for US pols and US activists, with a thin curtain to veil what they have become. Throw Money At It solutions don't and devolve into slush funds.
I've been very slowly wading through an excellent book, When Helping Hurts. I'm not exactly its target audience, which is Christian relief-focused charity organization leaders and church leaders, but it has important points relevant to personal giving, including for non-religious people. One of its big points - perhaps a summary of most of the book - is that throwing $$$$, technology/equipment, food/goods, and even people at a problem without understanding the people who have the problem, their capabilities, and a way for those people to work their way through the problem will accomplish little and will often harm those supposedly helped. That is exactly what US gooberment social programs and foreign aid often/usually do, throw $$$$, technology/equipment, food, etc. at problems. That this sometimes succeeds is obvious, but the harm done in dependency and fraud is probably 2X-4X greater.